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270                       GEMS AND PRECIOUS STONES IN THE
more especially at Guysborough. This mineral, when in perfect crosses, finds some sale in Switzerland for charms.
Diopside is found as a rock-constituent in many localities in the Laurentian area. At Calumet Falls, Que., it occurs in crys­tals 6 inches long, though not of gem value.
Scapolite or wernerite occurs in large cleavable masses in a limestone at Grenville, Que., and Bathurst, Ont. When free from the lilac-colored crystals of pyroxene with which it is asso­ciated, it admits of a good polish, but is of little value, if any, in the arts.
Ilvaite has been found in a boulder about a foot in diameter in the vicinity of Ottawa, Ont., and is believed to form a bed in the Laurentian series. It has little value as a gem, but is occasionally used for the letter I in sentimental jewelry.
Sodalite in fine blue grains has been found in the granite of Brome, Que., in seams at Montreal, Que., and in veins several inches wide on the line of the Canadian Pacific Railway, at Kicking Horse Pass, B. G, by Dr. B. J. Harrington. It is occasionally used in the arts.
Lazulite is reported from the Hudson Bay district, but of little gem value even when of fine color.
Prehnite is associated with native copper and calcite in the Lake Superior region, where it is often of a rich green color, in spherical masses of crystals an inch across, or in aggregations even larger, affording a curious green stone resembling a chrysoprase. Fine specimens occur at Clifton, Clark's Head, and Black Rock, Kings County, N. S.
The titanites of Canada have a world-wide reputation, not only for their color, their polish, and the perfection of the crys­tals, but also for their great size. A twin crystal of this mineral has been found on Turner's Island, in Lake Clear, weighing 80 pounds. They occur abundantly in this region, associated with apatite. The crystals are generally of such deep brown color as to appear black. It is rare that even a small transparent gem could be cut from them; as crystals, however, they are unexcelled, and many thousand dollars' worth have been sold as specimens. The finest are found in Renfrew County, especially in Sebastopol and Brudenell Townships, Ont.